Lily Collins tries out retro glam hair

The actress wowed with a 40s-inspired look as she promoted her latest film

Lily Collins (and her hair) are here to prove that even with straight and short locks you can still add va va voom with plenty of height and movement if you pick the right up do. The actress' latest hairstyle, that she debuted in Philadelphia on Friday, featured the elegance of a bygone era but brought things back to 2013 with her sultry outfit.

As she pounded the pavements in thigh-high boots, a sheer red shirt and black shorts, ooh la la, Lily balanced things out with a sophisticated up do. Her bobbed brunette locks were parted to the side with a pin curl effect working it's way around her face finished off with a voluminous bun at the back (no doubt thanks to a doughnut).

With such a strong look, and those powerful eyebrows that would make Cara Delevingne wince and a deep red lip to boot, all eyes were most certainly on Lily and not her hot co-star Jamie Campbell Bower as the couple promoted their new film, The Mortal Instruments: City of Bones.

When attempting to replicate such a style be sure there are no flyaways or loose strands as this look requires a preened finish, so have your hairspray close by!

What do you think of this look? Would you like to try Lily Collins' up do? Do you think you need to add a modern twist to things? Let us know below or tweet us @CosmopolitanUK

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